Rotary calcining kiln



Sept. 6, 1966 w. A. REANEY ET AL 3,271,018

ROTARY CALCINING KILN Filed April 8, 1964 FIG FIG 3 INVENTORS WARFORD A. REA IVE) DAV/D W. REANEY ATTORNEY United States Patent 3,271,018 ROTARY CALCINING KILN Warford A. Reaney, 264 W. Lincoln Ave., Delaware, Ohio,

and David W. Reaney, 898 Shore Drive, North Madison, Ohio Filed Apr. 8, 1964, Ser. No. 358,220 1 Claim. (Cl. 26333) The invention disclosed and claimed in this application relates to rotary lime calcining kilns. An embodiment of such a kiln is illustrated and described in this application.

In rotary lime calcining kilns of the type referred to, one of the difliculties heretofore encountered relates to the tendency of the lime to separate into fines and larger components and into lighter and heavier portions. This causes some portions of the lime to be heated excessively and other portions do not receive enough heat. In order to overcome this tendency, it has been proposed by various inventors to provide projections, pockets or other obstructions to lift the lime as the kiln rotates and then drop it down to continuously mix the various portions of the lime. However, in these devices, it often occurs that the kiln wears or is burned out at the points of the pockets or obstructions with a result that the kiln as a whole becomes worthless.

It is one of the objects of our invention to provide an improved rotary lime calcining kiln.

A further object of our invention is the provision of a lime kiln of the character described in which there are provided replaceable pockets which catch the lime as the kiln revolves, carry it part way around the kiln and drop it, thus producing a tumbling action which mixes the various portions of the lime.

Further objects, features and advantages of the invention will be apparent from the following description, the claims and the accompanying drawings.

In the drawings:

FIG. 1 is a view in vertical section of a kiln constructed according to our invention;

FIG. 2 is a view in vertical section taken transversely of the view of FIG. 1 and further illustrating the kiln shown in FIG. 1; and

FIG. 3 is an enlarged view in vertical section showing more clearly one of the replaceable pockets.

Detailed description Referring still to the drawings for a more detailed de scription of the invention, we have shown in FIG. 1 an illustrative embodiment of our invention comprising a kiln generally designated 11 mounted to rotate on bearings 12 and 13. The kiln is inclined downward to the left as shown in FIG. 1. Heat is introduced through a burner tube 14, which produces a flame 15. Lime to be calcined is introduced in a trough at 16 and flows out through the spout 17. Around the periphery of the kiln there are a plurality of pockets such as 21, 22, 23, 24, 25 and 26. These pockets catch the lime as the kiln revolves, carry it part way around the kiln and drop it, thus producing a tumbling action which mixes the lime. The kiln 11 comprises a cylindrical refractory shell 27 enclosing a chamber 28. It is essentially an elongated cylinder formed with open ends. Normally the lime under treatment advances through this cylinder. Although the kiln as shown and preferably is formed of a ceramic material,

3,271,018 Patented Sept. 6, 1966 ice it might be formed of heat resistant metal. Theburner tube 14 is means for applying heat to the advancing material, the flame 15 being formed by the combustion of gas which is supplied by the burner tube 14.

The kiln 11 is formed with the openings 31, 32, 33, 34, 35 and 37, and is formed adjacent to these openings with flanges such as flanges 41, 42, 43, 44, and 46. Secured to the flanges 41-46 inclusive are receptacles with restricted mouth openings such as those shown at 51, 52, 53, 54, and 56. Each of the receptacles is formed with a flange such as, for example, flanges 61, 62, 63, 64, and 66, which cooperate with flanges 41, 42, 43, 44, 45 and 46 to secure the receptacles to the shell 27. The flanges 61, 62, 63, 64, 65 and 66 and the flanges 41, 42, 43, 44, 45 and 46 are formed with complementary bolt holes. Bolts such as 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 82 and 83 are secured through such bolt holes and hold the flanges and the receptacles together. The receptacles, such as 51, 52, 53, 54, 55 and 56, are formed of a suitable metallic or ceramic material and may, when they are worn or have been used for a certain length of time, be removed and replaced by new receptacles. This increases tremendously the life of the kiln. The bolts 7183 inclusive secure the receptacles 51-56 inclusive to the rotatable furnace with the mouth openings thereof in alignment with the openings 31-36 inclusive in the furnace.

The operation is relatively simple. The cylinder shell 27 is rotated on the bearings 12 and 13. The burner tube 14 is ignited to produce a flame 15. Lime to be calcined is introduced into the trough 16. This travels through the kiln from right to left as seen in FIG. 1 moving downward to the left because of the inclination of the cylinder 27. As the lime moves downward, some of this is caught in the pockets 21-26 inclusive and carried around and up and then poured down so that it tumbles into the kiln, is thoroughly mixed and evenly heated. Should one or more of the receptacles 21-26 begin to wear, it may be replaced easily without dismantling the kiln by removal of the appropriate bolts of the bolts 71-83 inclusive.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus and that changes may be made therein without departing from the scope of the invention which is defined in the appended claim.

We claim: A rotary kiln for treating material such as lime comprising, in combination:

a cylindrical drum, having a cylindrical wall of refractory material forming the shell of said drum, having a plurality of circumferentially and longitudinally spaced wall openings formed through said cylindrical wall through which a portion of the material being treated may at times move, and having end openings at the ends thereof for the input of material to be treated and for the outlet of material which has been introduced at the inlet end, treated within the drum, and after treatment, removed at the outlet end;

means for mounting said drum for rotation substantially about its longitudinal axis and with its longitudinal axis at an acute angle to the horizontal and sloping from the inlet end downward towards the outlet end;

r 3 4 means for rotating said drum continuously about its one of said receptacles, and each of said receptacles longitudinal axis; being removable and replaceable; and means for supplying material to be treated to the inlet fastening means for securing said receptacles to said end of said kiln; cylindrical drum with their mouths in alignment with means for removing material which has been treated 5 the openings in said drum.

from the outlet end of said kiln; means for applying heat to the material to be treated References Cited y the Examine! within the interior of said drum; UNITED STATES PATENTS a plurality of separable heat resistance receptacles secured to the outside of said kiln each having an open 10 g g mouth, each formed With a substantially closed in- 2784499 3/1957 '5 X terior except for said mouth, each having the mouth secured in registration with one of said Wall open- FOREIGN PATENTS ings, each of said receptacles being staggered longi 3 3/1931 Austra1ia tudinally about said wall relative to adjacent re- 15 ceptacles, each of said Wall openings registering with JOHN J. CAMBY, Acting Primary Examiner. 

